DCA3 is a fan port of GTA 3 to the Dreamcast, more information here: https://dca3.net/
This is the alpha release of DCA3 running in Deecy, my Dreamcast emulator (https://github.com/Senryoku/Deecy)
Turning off the "Trails" gfx as I do at the start of video is necessary as Deecy does not support framebuffer reads yet. Issues do not stop there, but still, it is kinda playable :)